When you tap the Download updates automatically switch to activate it, updates will be downloaded when the Galaxy S8 Wi-Fi is connected to a network.

2. Updating with Smart Switch
You can update your Galaxy S8 using the computer or laptop, but it must connected to internet, and follow the tutorial below :

Connect the device to a computer and update the device to the latest software.

On the computer, visit www.samsung.com/smartswitch to download and install Smart Switch.

On the computer, launch Smart Switch.

Connect the device to the computer using a USB cable.

If a software update is available, follow the on-screen instructions to update the device.

Warning on Update :

Do not turn off the computer or disconnect the USB cable while the device is updating.

While updating the device, do not connect other media devices to the computer.

Doing so may interfere with the update process. Before updating, disconnect all other media devices from the computer. Ensure you follow this galaxy S8 user manual/guide or you will got your S8 problems

Uninstalling or disabling apps
After update proses finished, you can uninstalling or disabling apps as you want to increse Galaxy S8 performance.

On the Apps screen, tap → Edit. The icon appears on the apps that you can disable or uninstall.

Select an app and tap DISABLE or OK.

Alternatively, on the Apps screen, tap Settings → Applications, select an app, and then tap DISABLE or UNINSTALL.

For some apps to operate properly, they may need permission to access or use information on your Galaxy S8. When you open an app, a pop-up window may appear and request access to certain features or information.